Mali: More territory taken from rebels

French-backed forces in Mali have taken more territory from Islamist rebels and are now about 150 kilometres from one of the two key cities still held by the militants.

The African Union has called upon its member countries to commit more troops to the mission, asking them to do so within a week.

But it's clear the African forces are being hampered by logistical problems.

The BBC's Bill Hayton reports.